Client cert authentication in Deskapp?

Does anyone know if there are plans for a client certificate integration in kopano deskapp? I would like to create a secure interface for external employees.
Think many admins would like this.

Will this solve it for you?

Introduced in DeskApp v1.6 already


I also saw this ticket.
It does not solve it for me.
At which point should I be able to deposit the certificate?
Again to my project:
I would like to use a reverse proxy that requests a client certificate
before the username/password prompt .
And I can not deposit this in the deskapp
(as I could for example in a browser at the webapp).